Producing a metallic coating on a non-vitreous surface.



UNITED STATES PATENT OFFICE.

SIEGMUND HELLER AND cARL BAUMGARTL, or TEPLITZ, AUSTRIA;

"HUNGARY.

Paooucme A METALLIC com-me ON A NON-VITREIOUS SURFACE.

Specification of Letters Patent.

Patented April 16, 1907.

Application filed August 5, 1905. Serial No.'272,930.

1'0 aZZ whom, it may concern.-

Be it known that we, SIEGMUND HELLER and CARL BAUMGARTL, subjects of theEmperor of Austria, residing in Te litz, Kaiserstrasse, Villa Luksch,Empire of Austria, and Teplitz, Meiss nerstrasse 851, Empire ofAustria-Hungary, respectively, have invented certain, new and usefulImprovements in Producing a Metallic Coating on a Non- Vitreous Surface.l

The invention relates to ceramic earthen or non-\vitreous objects, suchas cooking vessels or the like, which are provided with a metal coatingmelted orfused on and strengthened or thickened by galvanic deposition;

' and the invention consists of an improved process of producing thesame.

The metal coating is roduced by melting onto the ceramic articlfinely-divided giltenamel tombac, together with a mixture of enamel andcalcined borax. Gilt enamel tombac is a preparation or alloy Whichisfireproof up to 1,200 centigrade. It is practical to mix two parts ofenamel with one part of calcined borax and one part of finely-dividedgilt-enamel tombac. Giltenamel tombac may consist of substantially threearts of cop er, one part of zinc, and one-eighth partof gold. Thismixture is put onto the ceramic objects to be coated and is burned1n'as, for example, in a muflie at a temperature of 800, centigrade.After. the article has cooled 'off the surface. of this fused orburned-in coating is ground, abraded, or polished, so that a clearmetallic surface appears. vanic bath, in which electro eposition takesplace, so that thereby the outer metallic envelop isplated, thickened,and strengthened to any suitable degree. The article is then ground andpolished. The metal coating thus produced adheres with exceedingfirmness to the base.

face a metallic composition containing gilt-- enamel tombac, and latingthis fused coatntestimony whereof we have signed our. names to thisspeclfication 1n the presence of two S11bSOI'1b1I1g wltnesses.

' SIEGMUND HELLER; CARL -BAUMGARTL.

ingfby electrodepositlon.

Witnesses:

'JosEF HAAs, FRANZ ERAMBAs.

The article is then placed in a gal-I

